If a person feels the need to stabilize traditional, non-IS binoculars, then perhaps they should resort to a mount of some type for them or switch over to IS binoculars.
On the other hand, traditional non-IS binoculars have been used effectively for many different purposes long before the existence of IS binoculars. In many situations there's little need to stabilize them in order to benefit from their use. The brain can be trained to adapt to their non-stabilized use.
Use the traditional binoculars. Adapt to their use. Try different approaches. Use them. Practice with them. Use them. Practice some more. If need be, try in a different way. Use them some more. The brain learns and adapts after a while; but if one doesn't have the time for that process, then buy or build a mount or purchase a pair of IS binoculars.
For myself, traditional non-IS binoculars are more than adequate for all of the things I use binoculars for. I've never, not even briefly, considered purchasing a pair of IS binoculars. For me, they're not necessary. They're not wanted. They're not cost effective (for me) and I don't want to get tied down by batteries when I don't need to use them. But I've already developed the skills to make effective use of my traditional binoculars.
Many of the newer kids on the block aren't interested in developing skills. They just want to see stuff; and they want to see it now. For them, the solution is more likely to be either the use of a mount or the expense of IS and an endless supply of batteries.